Nut-lock.



No. 644,548. Patented Feb. 27, I900.

. S. FERBIS.

NUT LOCK.

(Application filed Aug. 3, 1899.) (No Model.)

wuemtoz w i/b'neooezy I I UNITED STATES PATENT FFICE.

SMITH FERRIS, OF NEW YORK, N. Y.

NUT-LOCK.

SPECIFICATION forming part of Letters PatentNo. 644,548, dated February27, 1900.

Application filed August 3,1 8 9 9- To all whom it may concern.-

Be it known that I, SMITH FERRIS, a citizen of the United States ofAmerica, residing in the borough of Manhattan, in the city, county, andState of New York, have invented a certain new and useful Improvement inLock- Nuts, of which the following is a description, reference being hadto the accompanying drawings, wherein- Figure 1 is an end View. Fig. 2is a side View. Fig. 3 is a view in longitudinal section on the planedenoted by the dotted line as m of Fig. 1.

The object of the improvement is the production of a lock-nut havingfeatures of novelty and advantage.

In the accompanying drawings the letter aw denotes a screw-threadedbolt. Its end is shaped polygonally, as well seen in Fig. 1. In one sideof this polygonal part of the bolt there is a mortise Ct.

The letter b denotes an ordinary nut carried on a threaded bolt.

The letter 0 denotes a cap fitting interiorly to the polygonal sides ofthe nut. It bears Serial No- 725,982. (No model.)

integrally the boss 0, which fits interiorly to the polygonal surfacesof the screw-threaded bolt. This nut-cap has the wedge-bottomed key-slotc.

The letter d denotes a wedgeshaped key. In the use of this device it isnecessary to turn the nut into a position which will allow the cap tofit thereon and also by its boss fit upon and to the polygonal surfacesof the bolt. Then the key may be driven home, and, if desired, the smallend of the key may be bent to one side, locking the key in its place.

I claim as my improvement In combination; the screw-threaded boltprovided with the polygonal surfaces and with the key-mortise; the nut;the nut-cap provided with the boss fitting interiorly to the polygonalsurfaces of the bolt and also provided with the wedge-bottomed key-slot;and the wedge-shaped key; all substantially as described and for thepurposes set forth.

SMITH FERRIS.

Witnesses:

W. E. SIMoNDs, LUITGARD MoRBA.

